I'm so sorry to hear about your miscarriage. I'm sure that was a very difficult time for you. If you don't have support at home, you can always find support here. The Spark Community will support you when you need it.
I give all new members one piece of advice and it's this,"Don't look at good health or weight loss with an all or nothing mentality". If the only healthy thing you did for yourself today was drink 8 glasses of water, that's still a step in the right direction.
Start with some simple changes first. Don't try to do everything at once or you will end up frustrated. Do your best to get out of the house. Take a walk. Walking is not only great cardiovascular exercise, it's a great way to reduce stress too. You might want to start blogging or writing in a journal. Writing out your feelings can be very cathartic.
Time heals all wounds, be patient with yourself and your body. And like I said, if you need support, post a thread in one of the forums.